As of April 21, 2015, Google Will Not Display Your Website in Mobile Devices unless it’s Mobile Responsive.

Why?…Because currently 75% of Searches are Now Done on Mobile Devices.

See below for the exact quote directly from Google’s mouth:

“…Starting April 21, we will be expanding our use of mobile-friendliness as a ranking signal. This change will affect mobile searches in all languages worldwide and will have a significant impact in our search results…”

Why Google Prefers Mobile over Non Responsive Websites

“Using responsive web design has multiple advantages, including:

It keeps your desktop and mobile content on a single URL, which is easier for your users to interact with, share, and link to and for Google’s algorithms to assign the indexing properties to your content.

Google can discover your content more efficiently as we wouldn’t need to crawl a page with the different Googlebot user agents to retrieve and index all the content.”